Powered by OpenAIRE graph
Found an issue? Give us feedback
addClaim

Would enhanced fecundity per unit mass for large hake likely have consequences for hake recruitment and for approaches to hake management

Authors: Butterworth, Doug S;

Would enhanced fecundity per unit mass for large hake likely have consequences for hake recruitment and for approaches to hake management

Abstract

The hypothesis that increases in spawning frequency for and more viable eggs from larger hake lead to their making a disproportionately large contribution to recruitment is critically examined. The high steepness (h) estimated for stock-recruitment relationships for other than short-lived fish species worldwide, together with high h estimates from assessments for the South African hake populations, are at variance with this hypothesis, and suggest that the effect postulated is more than compensated by other densitydependent effects operative over the egg-to-recruit stage. This conclusion is supported by the relative insensitivity of OMP robustness test performance statistics to variations in underlying resource dynamics to incorporate this effect. Furthermore, even if larger hake off South Africa had been effectively protected from trawling in refugia, their numbers would have fallen as a result of the effects of fishing on younger animals; however no substantial decrease in recruitment is evident in assessments. While these counter-arguments do not exclude the possibility that recruitment is notably influenced by such effects (perhaps under more complex stock structure hypotheses), models fitted to data which demonstrate such behaviour would need to be developed before the hypothesis might be accorded any priority for attention in further research planning.

Country
South Africa
Related Organizations
  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
    OpenAIRE UsageCounts
    Usage byUsageCounts
    visibility views 7
    download downloads 5
  • 7
    views
    5
    downloads
    Powered byOpenAIRE UsageCounts
Powered by OpenAIRE graph
Found an issue? Give us feedback
visibility
download
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
OpenAIRE UsageCountsDownloads provided by UsageCounts
0
Average
Average
Average
7
5
Upload OA version
Are you the author of this publication? Upload your Open Access version to Zenodo!
It’s fast and easy, just two clicks!